I couldn't justify the expense to go EQ6 over Heq5Pro originally, but have been pleasantly surprised with its performance and convenience (particularly as I set up and pull everything down any time I observe or image at home or at dark skies). I don't think you'll want to put much more than 10kg on it for astrophotography though. Visual you might get up to 15kg, but you'll need a 3rd counterweight.
I used to use an extension bar to get a bit extra counterweighting when I had a piggyback refractor, but with the SSAG in an old 9x5 finder there's no need (and the tracking is much better).
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